MEXICO CITY.- Five footprints from human feet, calculated to be between 4,500 and 25,000 years old, were discovered in the Sierra Tarahumara, in Chihuahua. Specialists said that the foot prints could belong to the first men who lived in this region that is today known as northern Mexico. These are the first human footprints that have been found in Chihuahua and once their age has been found out, they will be added to the few footprints from the first people that lived in the American continent that are preserved in Mexico, particularly in Cuatro Ciénegas, Coahuila and in a ranch in Sonora. The footprints correspond to three adults and a child that probably lived in the caves that are located in the sierra, in the Valle de Ahuatos, eight kilometers from the town of Creel, in Chihuahua.